Mechanism for drawing textile rovings



'March 30, 1937 F. cAsABLANcAs 2,075,571

MECHANISM FOR DRAWING TEXTILE ROVINGS Filed Dec. 2, 1936 2 Sheets-Shea?I l 15j mamqm,

March 30, 1937. F, CASABLANCAS 2,075,571

MECHANI-SM FOR DRAWING TEXTILE ROVINGS Filed Dec. 2, 1936 2 Sheets-Sheet 2 j www @Mz-W Patented Mar. `30, 1937- UNITED STATES PATENT OFFICE ROVIN GISl Fernando Casablancas, Sabadell, Spain Application December 2, 1936, Serial No. 113,928 In Spain December 13, 1935 8 Claims.

This invention relates to improvements in or modifications of the invention set forth in the specification of my British Patent No. 309,905

' which relates to drawing mechanisms for textile rovings utilizing a pair of endless belts which conduct the roving to the drawing cylinders. In

the arrangement according to this prior patent specification the two guide rods which guide internally the front loops of the belts are constructed in` the form of a single U shaped member which is removably mounted in the frame of the mechanism.

'I'he improvements forming the subject of the present invention relate to the construction and arrangement of this U-shaped member and of the frame at the part at which it supports the U-shaped member, and have for their chief object the provision of a mechanism in which a perfect guiding of the belts is obtained and in which the U-shaped member cannot be shifted from its correct position by the action of the belts. Y

It happens occasionally in the known mechanism that, if the upper belt is slack, the U- shaped member rocks and slips forward, out of its correct position altering the point at which the belts feed the roving to the drawing cylinders. On the other hand,. if the upper belt is too tight there is a tendency for it to lift the U- shaped member moving it from its correct position, again with the result that the feed of the roving to the drawing cylinders is impaired.

` In order to obviate these drawbacks, according to the present invention the two arms of the U-shaped member, which are of approximately flat shape and are inclined or convergent in cross section, and the profile of the front part of the side plates. of the frame are so formed that the lower arm of the U-shaped member is supported by the side plates both at its front edge and at its rear edge and is at the same time engaged by a stop or projection on the side plates, which prevents the rocking of the U-shaped member in the forward direction.

With this arrangement, however, any sliding movement of the U-shaped member in the forward direction is also prevented owing to the inclined position of the two limbs thereof. The upward movement of the U-shaped member is 50 prevented or limited by the same arrangement of the lower arms, or a small projection may be formed on the side plates to engage the upper arm of the U-shaped member, thus preventing the raising thereof.

In order that the said invention may be clearly understood and readily carried into effect reference is had to the accompanying drawings in which, 'for the sake of simplicity, only the parts of the mechanism which are necessary for the understanding of ,the invention have been illustrated. Referring to the drawings:

Figure l is a sectional view of a drawing mechanism constructed in accordance with the invention showing the guide frame, the endless belts and the cylinders operating the belts,

Figure 2 is a front view of the frame and the member guiding the belts seen .ink the direction of the arrow II of Figure 1.

Figure 3 is a view in perspective on a larger scale of the U-shaped member guiding the belts.

Figure 4 isa detail view on a larger scale of one of the side plates of the frame showing the manner in which the U-shaped member is fitted therein. l

Figure 5 shows a modification" in which the side plates are formed with a projection for retaining the upper limb of the U--shaped member in position.

Figure 6 is a detail view showing the form of the U-shaped member in cross section if it be desired to reduce the distance between its two limbs with the object of increasing the pressure exerted by the belts on the roving. f

Figure 7 is a sectional view of a second constructlonal form of drawing mechanism according to the invention showing the guide frame, the belts and the cylinders.

Figure 8 is a detail view on a larger scale showing the form of the side plates of the frame shown in Figure 7.

Figure 9 shows a modification in which the side plates have a projection for retaining the upper limb of the U-shaped member in place.

As will be seen from the drawings, the two belts I and 2 of the drawing mechanism are actuated by two cylinders 3 and 4 in the known manner and are guided in the lateral direction by a frame formed of two side plates 5 suitably connected together by transverse members 6 and 1.

In order to guide the front loops of the belts plates 5. These recesses I3 are each bounded by an edge on which the arm 8 rests at both its front and rear edges and by a projection I6 which engages the upper surface of the arm 9, thus preventing the member 8 from rising or rocking forward.

Furthermore, with the object of preventing the member-8 from being displaced laterally, one or both ends of the arms 9 and I0 are formed with l0 a widened portion in which is a recess II the edge of which is adapted to engage the side plate 5. Thus when the side plate enters these recesses II lateral movement of the member 8 is prevented. The widened part of the arms 8 and I0 in which the recess II is formed preferably constitutes an inclined edge I2 to facilitate th correct positioning of the member 8.

In this way, the U-shaped member 8 is fitted in the frame in such a manner that it cannot be displaced from its proper position during the operation of the mechanism even when the tension on the upper belt is below its correct value. On the other hand, the member 8 may readily be Withdrawn by hand when necessary merely by grasping it by the part connecting the two arms and moving it slightly forward to disengage the recesses II from the edge of the plate 5, whereupon it may be withdrawn laterally from the mechanism.

If it be desired further to ensure that the U-shaped member cannot rise, the arrangement illustrated in Figure 5 may be adopted, in which the side plate 5 of the frame has, in addition to the recess I3, a projection I 4 which retains the upper arm of the member 8. These projections also ensure that the two arms of the member 8 cannot be bent apart, as sometimes occurs when the belts are very wide and the limbs of the U-shaped member are of relatively great length.

In the constructional form illustrated in Figures 7 to 9, the lower arm 9 of the U-shaped member 8 rests on the part I5 of the edges of the side plates 5, so that it is also supported at its front and rearvedges, but in addition the plates 5 are each formed with a projection I6 which defines the position of the member 8 and prevents it from being displaced or fromjrocking forward.

If it be desired to ensure that the U-shaped member 8 cannot move upwards, it is possible to 5'0 give the side plates 5 the form illustrated in Figure 9, in which the profile of the plate alsocomprises a projection I4 which retains the upper arm Ill of the member 8 in position, preventing it from rising.

In all the constructions described the member 8 may readily be withdrawn and replaced by another similar member the arms of which are a different distance apart at the edges at which they touch the belts, with the object of varying,

in the manner already known, the pressure which the belts exert on the roving at the point of delivery of the latter. To this end, the distance between the two arms 9 and I0 of the member 8 may be made bigger or smaller without varying the relative inclination of the arms, while it is also possible to give these arms the section illustrated in Figure 6, in which` each of them has at the edge at which it exerts friction on the belt,

a widened portion or flange I9 thus reducing the distance between the edges of the two limbs without varying, on the other hand, the distance apart or relative position of the body of these limbs.

What I claim and desire to secure by Letters 75 Patent of the United States is: f

1. In a drawing vmechanism for textile rovings utilizing a pair'of endless belts, the combination of a frame comprising a pair of spaced apart side plates connected together and formed with projections on their front faces, a pair of rolls driving the said belts and supported by the said frame,

and a U-shaped member removably supported in the said frame with the arms of the said U-shaped member guiding internally the front loops of the said belts, said arms being parallel longitudinally, of fiat shape and convergent in crosssection and being so formed in conjunction with the said side plates that the lower of the said arms is supported adjacent both its front and rear edges by the side plates and is engaged by the said projections to prevent rrocking movement of the U-shaped member.

2. In a drawing mechanism for textile rovings utilizing a pair of endless belts, the combination of a frame comprising a pair of spaced apart side plates connected together and each formed at its front edge with a recess and a projection, a pair of rolls driving the said belts and a U-shaped member removably supported in said recesses with the arms of the said U-shaped member guiding internally the front loops of the said belts, said arms being parallel longitudinally, of flat shape and convergent in cross-section and being so vformed in conjunction with the said side plates that the lower of the said arms is supported adjacent both its front and rear edges in the said y projections on their front faces, a pair of rolls l driving the said belts and supported by the said frame, and a U-shaped member removably supported in the said frame with the arms of the said U-shaped member guiding internally the front loops of the said belts, said arms being parallel longitudinally, of iiat shape and convergent in cross-section and being so formed in conjunction with the said side plates that the lower of the said arms is supported adjacent both its front and rear edges by the sideplates and is engaged at its front edge by the said projections to prevent forward movement of the U- shaped member.

4. In a drawing mechanism for textile rovings utilizing a pair of endless belts, the combination of a frame comprising a pair of spaced apart side plates connected together and each formed at its front edge with a recess and a projection, a pair of rolls driving the said belts and a U-shaped member removably supported .in said recesses with the arms of the said U-shaped member guiding internally the front loops of the said belts, said arms being parallel longitudinally, of fiat shape and convergent in cross-section and being so formed in conjunction with the said side plates that the lower of the said arms is supported adjacent both its front and rear edges in the said recesses and the upper of Said arms vis engaged at its upper face by the said projections to prevent rocking movement of the U-shaped member.

5. In a drawing mechanism for textile rovings utilizing a pair of endless belts the combination of a frame comprising a pair of spaced apart side plates connected together and each formed at its front edge with a recess anrd a pairof projections, a pair of rolls driving the said belts and a U-shaped member removably supported in said recesses with the arms of the said U-shaped member guiding internally the front loops of the said belts, said arms being parallel longitudinally, 5 of ilat shape and convergent in cross-section and being so formed in conjunction with the said side plates that the lower of the said arms is supported adjacent both its front and rear edges in the said recesses and is engaged at its upper face by the l lower of said projections, and the upper of said arms is engaged at its upper face by the upper of said projections to prevent both rocking and forward movement of the U-shaped member.

6. In a drawing mechanism for textile rovings l utilizing a pair of endless belts, the combination of a frame comprising a pair of spaced apart side plates connected together and each formed at its front edge with a pair of projections, a pair of rolls driving the said belts and supported 20 by the said frame, and a U-shaped member removably supported in the said frame with the arms of the said U-shaped member guiding internally the front loops of the said belts, said arms being parallel longitudinally, of at shape and 25 convergent in cross-section and being so formed in conjunction with the said side plates that the lower of the said arms is supported adjacent both its front and rear edges by the side plates and is engaged at its front edge by the lower of said 30 projections, and the upper of said arms is engaged at its upper face by the upper of said projections to prevent both rocking and forward movement of the U-shaped member.

7. In a drawing mechanism for textile rovings 35 utilizing a pair of endless belts, the combination of a frame comprising a pair of spaced apart side plates connected together and formed with projections on their front faces, a pair of rolls driving the said belts and supported by the said frame, and a U-shaped member removably supported in the said frame with the arms of the said U-shaped member guiding internally the front loops of the said belts, said arms being parallel longitudinally, of fiat shape and convergent in cross-section and being so formed in conjunction with the said side plates that the lower of the said arms is supported adjacent' both its front and rear edges by the side plates and is engaged by the said projections to prevent rocking movement of the U-shaped member, said arms also being formed with recesses adjacent one of their ends and adapted to engage one of said side plates to prevent lateral movement of the U-shaped member.

8. In a drawing mechanism for textile rovings utilizing a pair of endless belts, the combination of a frame comprising a pair of spaced apart side plates connected together and formed with projections on their front faces, a pair of rolls driving the said belts and supported by the said frame, and a U-shaped member removably supported in the said frame with the arms of the said U-shaped member guiding internally the front loops of the said belts, said arms being parallel longitudinally, of at shape and convergent in cross-section and being so formed in conjunction with the said side plates that the lower of the said arms is supported adjacent both its front and rear edges by the Side plates and is engaged by the said projections to prevent rocking movement of the U-shaped member, said arms also being formed with recesses adjacent each of their ends and adapted to engage said side plates to prevent lateral movement of the U-shaped member.

FERNANDO CASABLANCAS. 

